391results about "Needle severing devices" patented technology

This invention provides a single-action anti-bird nest thread-cutting mechanism and its control method. The single-action anti-bird nest thread-cutting mechanism includes a fixed blade, a rotatable movable blade, a thread-cutting drive source, and a thread-cutting drive assembly. The fixed blade has a fixed blade edge. The thread-cutting drive source is connected to the movable blade via the thread-cutting drive assembly, driving the movable blade to rotate towards or away from the fixed blade. The movable blade has a starting thread hook groove and a separating thread hook groove. The starting thread hook groove allows the sewing machine needle to pass through. The movable blade has a moving blade edge on its surface facing the fixed blade. The starting thread hook groove and the separating thread hook groove are distributed on the same side of the moving blade edge. This application uses the same thread-cutting drive source and the same set of movable and fixed blades to achieve the purpose of preventing bird nests during the starting thread cutting and automatic thread cutting after sewing, effectively avoiding thread breakage during the starting thread and achieving a stable effect of normal starting thread without bird nest clumps.

The utility model provides a thread trimming mechanism and a sewing machine with the same. The thread trimming mechanism comprises a first movable cutter which comprises a thread clamping part and a first cutting edge part; the second movable cutter is arranged on one side of the first movable cutter, and the second movable cutter comprises a thread collecting groove and a second cutting edge part, and the thread collecting groove is used for allowing the upper threads to penetrate through; the second cutting edge part is located on the side, away from the first movable cutter, of the line concentration groove and faces a groove opening of the line concentration groove. The first cutting edge part is located on the side, away from the second movable cutter, of the thread clamping part and faces the thread clamping part. Wherein the second movable cutter is movably arranged in the direction close to or away from the first movable cutter so as to move to a thread clamping position where a clamping gap used for clamping an upper thread is formed between the thread clamping part and the second cutting edge part or a thread cutting position where the first cutting edge part and the second cutting edge part are in contact to cut off the upper thread. According to the technical scheme provided by the utility model, the technical problem that bird nest stitches are easily formed when a sewing machine in the prior art starts sewing can be solved.

The utility model provides a thread trimming structure of a sewing machine, and belongs to the technical field of sewing machines. The problems that an existing thread trimming structure is insufficient in working reliability and short in service life are solved. The thread trimming structure of the sewing machine comprises a thread pressing piece, an auxiliary cutter arranged on a machine base and a movable cutter which is located below a needle plate and can vertically swing around a rotating shuttle shaft of the sewing machine, the auxiliary cutter is provided with a thread trimming end with an auxiliary cutter edge, a thread hooking groove is formed in the movable cutter, and a movable cutter edge is formed in the upper edge of the thread hooking groove. When the movable cutter swings upwards, the thread hooking groove can directly face the needle falling hole up and down, when the movable cutter swings downwards, the cutting edge of the movable cutter can be meshed with the cutting edge of the auxiliary cutting edge, the thread pressing piece is movably connected to the upper side face of the movable cutter, and the movable cutter is further provided with a reset spring acting on the thread pressing piece. And when the auxiliary knife edge is meshed with the movable knife edge, the thread trimming end of the auxiliary knife can abut against the lower side face of the thread pressing piece. The working reliability and the service life of the thread trimming structure can be improved.

The present application provides a cloth feeding mechanism and a sewing machine for a sewing machine, specifically relating to the technical field of sewing machine manufacturing. The cloth feeding mechanism has a cloth feeding drive source and a lifter drive source. The cloth feeding drive source indirectly drives the tooth carrier of the cloth feeding mechanism. While the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion. The tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. By using the cloth feeding drive source to indirectly drive the tooth carrier of the cloth feeding mechanism, and while the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion, it is realized that the tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. The present application makes full use of the drive source of the sewing machine, effectively improves the utilization efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, and has high value for use and promotion.

The utility model relates to a machine head integrated cutter structure which comprises a machine shell and a mounting shell integrally formed on the machine shell, a first cavity and a second cavity are formed in the mounting shell, a sliding rod and a driving structure for driving the sliding rod to vertically slide are arranged on the first cavity in a sliding mode, and the top end of the sliding rod is located in the first cavity; the bottom end of the sliding rod downwards penetrates through the first cavity, and the cutter is installed at the bottom of the sliding rod. The driving structure comprises a motor, a sliding spring and a cam; the cam is rotationally connected to the inner wall of the first cavity, the axis of the cam is transverse, and the motor drives the cam to rotate; a sliding block is arranged at the top end of the sliding rod, the sliding spring is located between the sliding block and the inner wall of the first cavity and jacks up the sliding block, and the cam rotates to press the sliding block downwards to enable the cutter to cut the line. The second cavity is used for installing the presser foot mechanism and communicates with the first cavity, and the sliding rod is connected to the first cavity in a sealed and sliding mode. The cutter structure has the effect that the cutter structure is more convenient to lubricate.

The present invention proposes a sewing machine with stitch length adjustment and zero-position positioning of a swing seat, specifically relating to the technical field of sewing machine manufacturing, comprising a driving source, a connecting rod, and a swing seat, characterized in that it also comprises an adjusting wheel and a slider, wherein the driving source drives the slider on the output shaft to indirectly position the swing seat at zero, and the slider is arranged on a slide groove of the adjusting wheel, the adjusting wheel is connected to the connecting rod, and the connecting rod is hinged to the swing seat. The present application has the characteristics of high accuracy in positioning the zero point of the swing seat, the static positioning wheel is fixed and equipped with an adjusting wheel to make the operation more stable, the gap between the various components is small after positioning, the degree of mechanical wear of the various components is small, and the noise is relatively low, which has the advantages of stable operation and high promotion and use value.

The utility model provides a swing mechanism in a sewing machine or a button sewing machine, and belongs to the technical field of sewing machines. The button sewing machine solves the problem of how to enable the moving precision of buttons on the button sewing machine to be high. And the like. According to the swing mechanism in the sewing machine or the button sewing machine, the sewing machine or the button sewing machine comprises a rack, a first power source and a swing bottom plate are arranged on the rack, the swing mechanism comprises a swing disc and a connecting rod assembly, the first power source is connected with the swing disc and can drive the swing disc to swing relative to the rack, a first through groove is formed in the swing disc, and a second through groove is formed in the connecting rod assembly. The inner end of the connecting rod assembly is hinged to the first through groove and can slide in the first through groove, and the outer end of the connecting rod assembly is connected with the swing bottom plate. The inner end of the connecting rod assembly is hinged into the first through groove, the first through groove plays a role in limiting swinging of the connecting rod assembly, the swinging precision of the swinging bottom plate is improved, and the moving precision of the button on the swinging bottom plate is improved.

The utility model discloses a trimming device for an upper pulling machine, which comprises an upper pulling machine main body, a fixed cutter group and a movable cutter group, the fixed cutter group and the movable cutter group are arranged on the upper pulling machine main body, the movable cutter group consists of a movable cutter group driving cylinder and a movable cutter group bearing, and the tail end of a piston rod of the movable cutter group driving cylinder is connected with a push arm. A middle connecting arm is hinged to the tail end of the push arm, a rotating frame is hinged to the tail end of the middle connecting arm, a clamping groove sleeve frame is connected and installed on the rotating frame, the movable cutter set bearing and the rotating frame are fixedly installed together, a clamping groove is formed in the side face of the clamping groove sleeve frame, and an arc-shaped movable blade is installed on the upper groove wall of the clamping groove. The feeding mechanism has the advantages that the feeding mechanism can be installed on an existing upper pulling machine structure, original upper pulling machine parts do not need to be replaced, a needle and thread assembly above the feeding wheel is not interfered, and the pushing connecting arm assembly is high in strength and durable.

The invention provides a thread trimming mechanism of a sewing machine, and belongs to the technical field of sewing machines. A thread trimming mechanism of a sewing machine comprises a fixed cutter; the movable cutter assembly is matched with the fixed cutter, can translate relative to the fixed cutter and is used for trimming threads; the driving assembly is used for driving the moving cutter assembly to move back and forth, the driving assembly comprises a swing rod, the swing rod can swing around a first axis, one end of the swing rod is movably connected with the moving cutter assembly, and the swing rod is further provided with a contact assembly; a thread trimming cam is fixed to the transmission shaft and makes contact with the contact assembly, so that the swing rod can swing in the direction away from the fixed cutter; a push rod of the pusher is connected with the lower end of the contact assembly, and the pusher is used for enabling the swing rod to swing towards the fixed cutter.

The utility model belongs to the technical field of sewing machines, and particularly relates to a double-stepping overedger which comprises a machine body, and a thread trimming assembly, a presser foot lifting assembly, a feed lifting tooth shaft and a feeding tooth frame are arranged in the machine body. The first stepping motor is arranged on the side face of the machine body, a first motor shaft is arranged in the first stepping motor, and double cams are installed on the periphery of the first motor shaft and used for driving the thread trimming assembly and the presser foot lifting assembly to act; the second stepping motor is arranged on the side face of the machine body, a second motor shaft is arranged in the second stepping motor, a first crank is installed on the periphery of the second motor shaft, and one end of the first crank is connected with a connecting rod. The second stepping motor can control the height of the feeding tooth frame, the rotation angle of the stepping motor is utilized to enable the teeth to operate according to the set height, through double-stepping control, non-pneumatization and non-electromagnet are achieved, production noise can be lowered, and the sewing effect is improved.

The utility model provides a trimming and presser foot lifting mechanism of a button sewing machine, which comprises a driving motor, a presser foot lifting driving block, a trimming driving block, a trimming blade and a button clamp block which are arranged in a machine shell, a driving cam is arranged on an output shaft of the driving motor, the presser foot lifting driving block and the trimming driving block both abut against the side face of the driving cam, and the button clamp block is arranged on the side face of the driving cam. When the driving motor drives the driving cam to rotate, the driving cam sequentially drives the thread trimming driving block and the presser foot lifting driving block to rotate, and the rotating thread trimming driving block and the rotating presser foot lifting driving block respectively drive the thread trimming blade and the button clamp block to sequentially rotate through linkage pieces. According to the trimming and presser foot lifting mechanism of the button sewing machine, the driving motor drives the driving cam to rotate, trimming and lifting are driven in a staggered mode, trimming is conducted firstly, then presser foot lifting is conducted, trimming thread ends are shorter, stitches are more attractive, the subsequent thread end trimming process does not need to be set, and therefore the production cost is reduced.

The invention discloses an upper thread sewing starting processing device and a sewing machine, and relates to the technical field of sewing machines, a needle plate assembly of the upper thread sewing starting processing device is provided with a needle plate hole, a thread grabbing plate and a thread clamping plate are movably assembled on the needle plate assembly, a thread trimmer is fixedly assembled on the needle plate assembly, the thread grabbing plate is provided with a thread grabbing hole, and the thread clamping plate is provided with a thread clamping head. The driving assembly is connected with the wire grabbing plate and the wire clamping plate and used for controlling the wire grabbing plate and the wire clamping plate to move. Wherein the moving route of the wire grabbing plate is a first route, and the moving route of the wire clamping plate is a second route; when the thread grabbing plate is located at the head end of the first route, the upper thread penetrates through the needle plate hole and the thread grabbing hole, and when the thread grabbing plate moves to the tail end from the head end of the first route, the upper thread is clamped by the thread clamping head and then cut off by the thread trimmer; when the thread clamping plate is located at the tail end of the second line, the thread clamping head loosens the upper thread. According to the upper thread sewing starting processing device, the upper thread can be clamped, cut off and loosened in one-time movement in the sewing starting stage, the movement process is simplified, and the sewing quality is improved.

The utility model relates to the technical field of bag sewing, and provides an automatic sewing machine for a zipper box, which is used for solving the problem of unsafety of manual flanging operation and comprises a rack, an operation table top is arranged on the rack, a sewing machine is arranged on the operation table top, and a sewing guide block is arranged on a machine base of the sewing machine. The sewing guide block is detachably arranged on a machine base of the sewing machine, a positioning protrusion is arranged at the position, located below a needle head of the sewing machine, of the sewing guide block in an upward protruding mode, a sewing channel is vertically formed in the positioning protrusion in a penetrating mode, and the front end face and the rear end face of the positioning protrusion are arc-shaped faces adapting to corners of an external extrusion frame. A flanging block is arranged on the side, close to the inner side face of the sewing machine body, of the sewing guide block, an arc-shaped turning face is arranged on the outer side face of the flanging block, a sewing opening is formed in the flanging block in an up-down penetrating mode, and a first driving structure is arranged on the rack.

The utility model relates to the technical field of bartacking machines, in particular to a combined driving mechanism of a bartacking machine and the bartacking machine. Comprising a thread sweeping mechanism used for executing a thread sweeping action; the presser foot lifting mechanism is used for executing a presser foot lifting action; the thread trimming mechanism is used for executing a thread trimming action; the driving motor is used for driving the thread sweeping mechanism, the presser foot lifting mechanism and the thread trimming mechanism to work; the thread sweeping mechanism comprises a thread sweeping action assembly, a thread sweeping mechanism and a thread sweeping mechanism, the transmission arm is used for being connected with the driving motor; the thread sweeping connecting rod is used for connecting the thread sweeping action assembly and the transmission arm, so that the driving motor can drive the thread sweeping action assembly to execute the thread sweeping action; the thread sweeping mechanism further comprises an independent driving assembly, and the independent driving assembly can independently drive the thread sweeping mechanism to work.

The utility model belongs to the technical field of sewing machine technologies, and relates to an anti-interference type multi-light-eye correlation structure and a sewing machine thereof, a thread trimming switch assembly is arranged on a machine head of the sewing machine, and a thread trimmer assembly is arranged in a machine shell. A plurality of light eyes electrically connected with an electric control module of the sewing machine are sequentially arranged in the cloth feeding direction of the sewing machine, and emitters and inductors of the light eyes are arranged on the machine shell and the thread trimming switch assembly respectively to form an up-down correlation structure. Wherein the inductor of at least one light eye is arranged on the thread trimming switch assembly, and the inductor of the adjacent light eye is arranged on the machine shell. According to the anti-interference type multi-light-eye correlation structure and the sewing machine with the anti-interference type multi-light-eye correlation structure, the effects of accurate control and short thread ends can be achieved.

To achieve a thread cutter of a sewing machine which can easily achieve sharpness and holding power of a bobbin thread.SOLUTION: A thread cutter 100 of a sewing machine is capable of adjusting sharpness of thread cutting by adjusting a pressing force for pressing a pressing part 41a of a first plate piece 41 to a movable blade 30 by a pressing power adjustment part 67 adjusting deflection of the first plate piece 41, and capable of adjusting the holding power of a bobbin thread by adjusting a contact pressure for pressing a felt material 50 mounted on a holding part 42a of a second plate piece 42 to the movable blade 30 by a contact pressure adjustment part 68 adjusting deflection of the second plate piece 42. Thereby, each can be adjusted independently, and sharpness of thread cutting and holding power of the bobbin thread can be both achieved relatively easily.SELECTED DRAWING: Figure 1

The technical scheme belongs to the technical field of sewing machines, and particularly relates to a double-moving-cutter thread trimming sewing machine which comprises a rack, a thread trimming mechanism and a rotating shuttle mechanism. The thread trimming mechanism comprises a first movable cutter assembly, a second movable cutter assembly and a driving assembly; the first movable cutter assembly and the second movable cutter assembly are rotationally arranged on the outer side of the matched rotating shuttle mechanism in a sleeving mode. The driving assembly drives the first movable cutter assembly to rotate between a first position and a second position around the axis and drives the second movable cutter assembly to move between a third position and a fourth position around the rotating axis. The first movable cutter assembly comprises a first thread trimming movable cutter, and the first thread trimming movable cutter is provided with a thread hole groove allowing a machine needle to penetrate through and hooking a sewing thread in the sewing starting stage and a first thread hooking groove allowing the sewing thread to be hooked in the ending stage; the second movable cutter assembly comprises a second thread trimming movable cutter; the thread hole groove or the first thread hooking groove hooks the sewing thread, the second thread trimming movable cutter is driven to rotate around the axis to abut against the surface of the first thread trimming movable cutter, the cutting edges of the two thread trimming movable cutters coincide to cut off the sewing thread, thread ends are reduced, and production efficiency is improved.

The utility model relates to the technical field of sewing equipment, in particular to an improved thread trimming mechanism of a sewing machine, which comprises a thread trimming structure, and the thread trimming structure comprises a movable cutter unit and a fixed cutter matched with the movable cutter unit for use; the movable cutter unit comprises a driving part, an annular supporting seat, a mounting part integrally formed with the annular supporting seat and a cutter, the cutter is mounted on the mounting part through a fastener, a first blade part is arranged on the cutter, and a second blade part meshed with the first blade part is arranged on the fixed cutter; the driving piece drives the annular supporting base to rotate so as to drive the first blade part of the cutter to approach the second blade part of the fixed cutter to cut off the thread residues. According to the thread trimming structure, the complex structure of a traditional thread trimming mechanism is simplified, and the manufacturing and maintenance cost is reduced. Meanwhile, the conveying mechanism is composed of a first gear, a second gear and a conveying belt, belt conveying transmits power through friction or synchronous gear meshing, instant impact force can be effectively reduced, and the problems of vibration and noise caused by rigid transmission are solved.

The invention relates to double-robot cooperative sewing equipment for a fiber preform. The double-robot cooperative sewing equipment comprises a first industrial robot, a second industrial robot, a feeding device and a workbench; a sixth joint of the first industrial robot is provided with a first sewing end effector, and a sixth joint of the second industrial robot is provided with a second sewing end effector; the first industrial robot and the second industrial robot are arranged on the two sides of the workbench correspondingly, and the feeding device is arranged on one side of the first industrial robot. The feeding device comprises a cam divider, a fixing frame and a needle and thread frame. The cam divider is installed at the bottom of the fixing frame, needle and thread frames are arranged on the two sides of the fixing frame, double-end sewing needles are arranged on the tops of the needle and thread frames, and thread trappers are arranged at the bottoms. Yarn penetrates through the double-end suture needle, and the tail of the yarn is fixed by a yarn trapper. The invention further comprises a suturing method using the device. Double robots are adopted for cooperative automatic sewing, the automation degree is high, the sewing point position precision is high, the sewing quality is good, and the efficiency is high.

The utility model provides a flat cutter thread trimming mechanism of a sewing machine and belongs to the technical field of sewing machines. The problem that an existing flat cutter thread trimming device is high in maintenance cost is solved. The flat cutter thread trimming mechanism of the sewing machine comprises a fixing frame, a rotating shaft vertically arranged on the fixing frame in a penetrating mode, a fixed cutter horizontally fixed to the fixing frame, a movable cutter connected to the fixing frame in a horizontal swinging mode and a movable handle arranged outside the rotating shaft in a sleeving mode and capable of rotating around the axis of the rotating shaft. The flat cutter thread trimming mechanism of the sewing machine further comprises a driving motor, a long-strip-shaped swing rod and a long-strip-shaped driving rod, an output shaft of the driving motor is vertically arranged, the swing rod and the driving rod are horizontally arranged, one end of the swing rod is fixed to the output shaft, and the other end of the swing rod is hinged to one end of the driving rod. And the other end of the driving rod is hinged with the other end of the movable handle. The flat cutter thread trimming mechanism of the sewing machine has the advantage of low maintenance cost.

The utility model relates to the technical field of sewing machines, in particular to a thread trimming mechanism of a sewing machine, which comprises a fixing frame, a top plate is mounted on the top surface of the fixing frame, a supporting plate is mounted on the upper surface of the top plate, and a motor body is mounted on the right side surface of the supporting plate. The output end of the motor body penetrates through the interior of the supporting plate to be provided with a rotating disc, and a connecting block is installed on the back face of the rotating disc. A sewing thread can be trimmed through the blade body, after the trimming operation is finished, the motor body is closed, then the telescopic rod is started, and the abutting block is driven to move towards the back face through the telescopic rod, so that the protruding part of the sewing thread can be clamped, follow-up use of the sewing thread is facilitated, and after the whole sewing thread is stable, the motor body is closed. At the moment, the motor body is started, the connecting plate and the blade body are restored to original positions, and therefore the operation effect is good during overall thread trimming.

The invention discloses an automatic thread-trimming and thread-loosening-preventing mechanism for a sewing machine, which adopts an integrated structure that a cam is driven by a single motor, adopts a single power source to synchronously control thread-trimming and thread-clamping actions, replaces a traditional electromagnet system and has a sewing-starting and thread-loosening-preventing function. In the invention, the thread loosening end and the presser foot lifting end of the cam are independently designed in a layered manner, so that compact integration of mechanical transmission is realized, the size of a machine head is obviously reduced, and after an electromagnet control scheme is replaced, the defects of high noise, easiness in heating and the like can be overcome; in addition, a thread clamping action is supplemented for a conventional sewing process, the motor controls the thread clamping assembly to clamp a free-state thread end after the thread cutting action is completed, it is ensured that the next sewing starting action can accurately complete the thread hooking action, and the phenomena of thread loosening and thread flying are prevented.

The invention provides a lower thread cutting device of a flat chain seam sewing machine. According to the utility model, the problem that the operator is difficult to understand and inconvenient due to the difference that whether the tension applied to the thread by the thread trapper can be released or not by operating the pedal and operating the presser foot lifting rod due to the presence or absence of the lower thread cutting device can be solved. The lower thread cutting device is provided with a lower thread cutting operation mechanism (5) which enables the thread loosening mechanism (4) and the lower thread cutting mechanism (3) to operate, and a presser foot lifting operation mechanism (6) which does not enable the lower thread cutting mechanism (3) to operate and enables the thread loosening mechanism (4) and the presser foot lifting mechanism (2) to operate. Therefore, the force of the thread trapper (11) can be released by operating the pedal plate with a foot regardless of the presence or absence of the off-line cutting device.

The utility model relates to clothing machinery, in particular to a clothing lower hem thread trimming device free of manual trimming, which comprises a lower thread trimming unit mounted below a needle plate surface of a sewing machine and an upper thread trimming unit mounted on a machine body of the sewing machine. The upper trimming unit and the lower trimming unit are provided with the same suction and shearing integrated module, the upper trimming unit can move downwards and be close to the needle plate face, and the upper trimming unit and the lower trimming unit attract and shear thread ends on upper threads and bottom threads of clothes pieces respectively. The device has remarkable advantages in the aspects of improving the production efficiency, reducing the cost, improving the product quality and the like, and is an ideal choice for automatic upgrading of the clothing manufacturing industry.

The utility model relates to sewing machine equipment, and discloses an electromagnetic trimming noise reduction mechanism and a sewing machine thereof, the electromagnetic trimming noise reduction mechanism comprises an electromagnet (11) installed on a base (10), a trimming driving shaft (12) and a trimming crank (13), the trimming driving shaft (12) penetrates through the trimming crank (13) to be connected with the electromagnet (11), one end of the trimming driving shaft (12) is sleeved with a first elastic element (14), and the other end of the trimming driving shaft (12) is sleeved with a second elastic element (14). The first elastic element (14) is arranged between the thread trimming crank (13) and the electromagnet (11); and a buffer pad (15) is fixed at the end part of the tangent driving shaft (12) and is in contact connection with an ejector rod of the electromagnet (11). The output force of an electromagnet is too large, electric control parameters are not easy to adjust, loud sound is generated when the electromagnet pushes a tangent driving shaft, and the using effect is affected. The first elastic element and the buffer pad are installed at the end of the thread cutting driving shaft on the mechanism, so that the sound generated when the electromagnet ejector rod impacts the thread cutting driving shaft is greatly reduced.

The utility model discloses a sewing machine trimming device for school uniform production, which comprises a base, a sewing machine main body is fixedly connected to the rear part of the top of the base, a limiting chute is arranged on the surface of the base close to the edge of the side surface, a micro motor is arranged in the limiting chute, a screw rod is arranged at the end part of the micro motor, and the screw rod is connected with the sewing machine main body. A guide block is arranged outside the lead screw in a sleeving manner, pneumatic scissors are movably mounted at the top of the guide block, extension plates are fixedly connected to the two sides of the pneumatic scissors, positioning holes are formed in the surfaces of the extension plates and the guide block, and positioning pins are inserted into the positioning holes. The pneumatic scissors are installed on the guide block, the guide block moves on the base in the horizontal direction under the action that the micro motor drives the lead screw, the use position of the pneumatic scissors can be adjusted, threads at different positions can be cut off conveniently, the pneumatic scissors and the guide block are connected through the positioning pin, and disassembly and assembly are easy and convenient.

The present application belongs to the technical field of sewing machines, and relates to a thread catching and air suction device of a sewing machine, which comprises: a rotating hook arranged below a bottom plate of the sewing machine and driven by a lower shaft to rotate along a first circumferential direction about an axis thereof; a thread cutting assembly comprising a fixed blade and a movable blade, the fixed blade being fixed below the bottom plate, the movable blade being in an arc-shaped plate structure, the arc shape of the movable blade being arranged at a distance from and surrounding an outer periphery of the rotating hook, the movable blade being rotatable from a sewing position to a thread cutting position along a second circumferential direction; a thread catching assembly comprising an arc-shaped thread catching plate, the arc shape of the thread catching plate being arranged at a distance from and surrounding the outer periphery of the rotating hook, an end of the thread catching plate being provided with a thread catching hole, the thread catching plate being rotatable from the sewing position to a thread catching position along the second circumferential direction; and an air suction assembly comprising an air suction pipe connected with a negative pressure device. The thread catching and air suction device of the sewing machine provided by the present application can solve the bird nest problem of the sewing machine, and has excellent high-speed adaptability and high motion precision.

The utility model relates to a 12-needle automatic thread trimming device which comprises a mounting plate, a fixed blade, a thread clamping assembly and a movable knife assembly, the fixed blade is fixedly mounted on one side of the mounting plate, the movable knife assembly comprises a movable knife rest and a plurality of thread hooking knives, the movable knife rest is slidably mounted on the mounting plate, and the thread hooking knives are opposite to the cutting edge of the fixed blade. A left movable arm and a right movable arm are arranged on the two sides of the movable tool rest respectively, the mounting plate comprises a bottom plate, a left extension plate and a right extension plate, the left extension plate and the right extension plate are arranged on the left side and the right side of the bottom plate respectively, a detachable left check block is arranged on one side of the left extension plate, and a first pushing area for the left movable arm to move is formed between the left check block and the bottom plate. The utility model aims to provide the 12-needle automatic thread trimming device, and the 12-needle automatic thread trimming device solves the technical problems that a whole mounting plate needs to be replaced after a baffle of an existing automatic thread trimming device is damaged or broken, and the stability is poor due to the fact that the covering and limiting area of a pressing plate is small in the sliding process of a sliding plate.

The invention belongs to the technical field of sewing equipment, and particularly relates to a sewing machine. The thread trimming driving mechanism comprises a thread trimming cam and a lifting piece, a thread trimming driving block is arranged at the upper end of the lifting piece, a thread trimming rolling piece abutting against the cam face of the thread trimming cam is installed on the thread trimming driving block, a movable tool apron is arranged at the lower end of the lifting piece and comprises an upper installation base and a lower adjusting base, and the upper installation base is fixedly connected with the lower end of the lifting piece. The lower adjusting seat is connected with the movable cutter through a linear adjusting mechanism, the linear adjusting mechanism drives the movable cutter to move longitudinally so as to adjust the distance between the movable cutter and the fixed cutter, the lower adjusting seat is connected with the upper mounting seat through a rotary adjusting mechanism, and the rotary adjusting mechanism drives the lower adjusting seat to rotate so as to adjust the inclination angles of the movable cutter and the fixed cutter; the distance and the inclination angle between the movable cutter and the fixed cutter are achieved through linear adjustment and rotary adjustment, the device adapts to different wire thicknesses or abrasion states, and the phenomenon that wires are clamped or are not cut off is prevented.

The invention provides an anti-nest thread trimming device and method and a sewing machine, and relates to the technical field of sewing machines, the anti-nest thread trimming device comprises a machine needle and a driving cutter, the driving cutter is arranged below a sewing material, and the machine needle is movably arranged between the upper portion and the lower portion of the sewing material; the driving cutter is provided with a thread passing hole, a first cutting edge and a first thread clamping part; the driving cutter is provided with a first position for the machine needle to penetrate through the thread passing hole to conduct first needle sewing and a second position for the machine needle and the driving cutter to be staggered to conduct follow-up sewing. The auxiliary moving cutter is provided with a second cutting edge; after first needle sewing is completed, the machine needle moves to the side, away from the thread passing hole, of the sewing material, and the first thread clamping part and the side, provided with the second blade, of the auxiliary movable cutter clamp the upper thread; after at least second needle sewing is completed, the auxiliary moving cutter moves to the position where the second cutting edge is in butt joint with the first cutting edge so as to cut off the upper thread. By means of the technical scheme, the problem that nest-shaped thread ends are likely to be generated in the thread trimming process of a sewing machine in the prior art can be effectively solved.